Gear pump for pressure lubrication purposes



Nov. 28, 1950 B. P. SCHMITT GEAR PUMP FOR PRESSURE LUBRICATION PURPOSESFiled July 8, 1947 q" WHIHIHH.

Berfrcrm R Salim/fr Patented Nov. 28, 1950 GEAR BUMP FOR PRESSURELUBRICATION PURPOSES Bertram P. Schmitt, Jamaica, N. Y. Application July8, 1947, Serial No. 759,501

My invention relates to improvements in gear pumps for pressurelubrication purposes, especially, although not necessarily.

The invention is designed with the primary objects in view of providinga simply constructed, lightweight, dependable gear pump adapted fordirect connection to a prime mover to supply lubricating oil underpressure, in proportions required, and which is especially constructedfor lower cost of manufacture, installation and maintenance, thanpresent-day pumps provided for similar purposes.

Other and subordinate objects, also comprehended by my invention,together with the precise nature of my improvements will be readilyunderstood when the succeeding description and claims are read withreference to the drawing accompanying and forming part of thisspecification.

In said drawing:

Figure 1 is a view in side elevation, partly broken away and shown insection, of my improved gear pump, in a preferred embodiment thereof;

Figure 2 is a view in horizontal section taken on the line 2--2 ofFigure 1;

Figure 3 is a view in transverse section taken on the line 33 of Figure1; v

Figure 4 is a detailed view of one of the twin gears.

Reference being had to the drawing by numerals, according to myinvention, in the illustrated, preferred embodiment thereof, a pump isprovided comprising an elongated, rectangular, narrow casing I, of anysuitable size, having a flat bottom 2 with ends 3 integral therewith,and flat sides 4, one integral with the bottom 2 and ends 3, and theother bolted to said bottom and ends, as at 5.

A substantially semi-circular, arcuate and flatbottomed trough 1,relatively narrower than the casing I, depends into the casing with itsconcave side uppermost from top extension webs i on the ends 3 of thecasing I, said trough 1 extending longitudinally co-planar with saidcasing I and being spaced from the bottom 2, as well as from the ends 3and sides 4 of said casing.

At a level in the casing I above the low point of the trough 1 suitablefor a purpose presently seen, said trough I is formed with a pair ofexternal pockets 9, 9, in part semi-circular, and which are arrangedco-planar with the trough I with open sides facing.

Discharge pipe lines I0, I I extend from the botr 2 Claims. (Cl.103-126) toms of the pockets 8, 9 out of the ends 3 of the casing Ithrough bushings I2, I3.

A central, internal, circumferential rib I4 in the trough I andlongitudinal side flanges I5 on said trough divide the same into a pairof sideby-side channels I6, I'I extending between the pockets 9, 9 andcommunicating with the open sides of said pockets.

A depending, bottom, inlet nozzle I8"on the trough I, in the verticaland transverse center thereof communicates with both channels I6, IIL

A gear wheel I9 is fitted in the trough I with side-by-side, dividedseries of gear teeth 20, 2I, adapted to revolve in the channels IS, ITwith a working clearance, said gear wheel I9 having its periphery at theroot of the series of gear teeth 29, 2I, engaged with the rib I4 andside flanges I5 to seal the channels at the sides thereof.

The gear wheel I9 is fixed, in any suitable manner, on a drive shaft 22suitably journalled in bearings 23 on a skeleton top plate 24 on saidcasing I and which surrounds said gear I9 and is bolted, as at 25, tothe webs 6 with a semicircular channel guard 26 arising therefrom andfitted over the gear wheel I9 above said plate 24.

Twin gears 21, 28 are provided in the pockets 8, 9 and which arerotatably fitted in the circular portions of said pockets 8, 9 and arerotatably mounted in the sides of said pockets by axial studs 29thereon. The twin gears 21, 28 each comprise a pair of side-by-sideseries of teeth 30,

3| meshing with the series of teeth 20, 2|, and acircumferential toothhigh flange 32 fitting in between said series of teeth 20, 2I againstthe periphery of the gear wheel I9.

An oil supply line 33 extends into one end 3 of the casing I and forsupplying under any suitable control, not shown, lubricating oil 34 tothe casing I and maintaining the same at a level slightly higher thanthe low point of the trough I.

Referring now to the operation of the described pump, the gear wheel I9is designed to be driven in opposite directions, respectively, from aprime mover, not shown, through the medium of reduction gearing, notshown, the direction of drive depending upon whether the prime mover isoperating forwardly, or reversely. Assuming that the gear wheel I9 isbeing rotated in the direction indicated by the full line arrow inFigure 1, suction will be created in the channels I6, I! on one side ofthe transverse center of the trough I, in a manner which will be clear,whereby oil will be drawn into the channels I6, I! through the inletnozzle I8 to be carried by the series of teeth 2|), 2| up said channelsto the twin gear 28. The twin gear 28 being rotated oppositely,relatively, by said gear wheel IS, the series of teeth 30, 3| thereofwill coact with the series of teeth 20, 2| to force oil carried by andbetween the teeth of the series 20, 2| out of the spaces between thesame to fall into the pocket 9 and issue out of the discharge pipe ll,under pressure, for conveying away from the pump for lu'- bricationpurposes. If the gear wheel 1 3 is retating in .the.opposite direction,indicated bygth'e dotted line arrow in Figure l, the operations justdescribed will take place on the other side of the transverse center ofthe trough l to effect discharge of oil, under pressure,'out -o'f =thedischarge pipe Ill.

The foregoing will, it is believed suflicetoi npart a clearunderstanding of my invention, without further explanation.

Manifestly, the invention, as described, ;is susceptible ofmodificatiomlwithout departing from t e inventive .e ncep lan ri h i heei .re-

served to such modifications as I311 -within the sco Q t eapnendedelais- 'What I claiinjs:

lam pumpha easi aiia tedto on ain. Q11, an arcu troug "said e n hav ng 7d flang a d .a lon itudina d din r b herein, an oil inlet in the troughat a point inidwayjloewe n t e enslsq sai rqi s'hltor admi t n 1 in t etrou h from aid cas n po u tion b i eated Lin th "trou h a gea whe withdivided s d by s de :se ie eth ifit ns a r rqus between said :fianees ani said whe being ,i urnaled ,on a ea in :for rotaon in opp dir ctio s. re neetive y. i 'eet s ct on in a d trou h "an carry .011 Item gsei in ettoward oppos t end of th tro gh altern ly linen ota ion 4 said wheel in.oppos t 4 directions, respectively, and means located between each endof said trough and said inlet operative by said wheel alternately inaccordance with the direction of rotation of said wheel to force oilfrom between the teeth of said series 7 out of said casing.

2. A pump according to claim 1, wherein the circumferential portion ofsaid wheel runs on .said fianges and rib to close and sealesaidrtrough,sa d z s ename rc mnr sine pock o said trough with discharge ports forcatching the oil forced from between the teeth of said series anddischarging the oil out of said casing,

and gear wheels smaller than the first-named wheel rotatable in saidpockets and having divided sid e by side series of gear teeth meshingwith the gear teeth of said first-named wheel;

said smaller gear wheels having tooth high flanges-thereon runningagainst the circumferential portion of the first-named wheel to prevenoi rem p ss n b twee th firs mam whee 'en'r w'sa d; malle ;see Whe l,BERT AM REFERENCES GI'DED {The following references are of record {inthe fileof this patent:

EUNEEED STATES PATENT S

